Overseaming sewing-machine.



G. M. EAMES & J. S. HNCH.

OVERSEAMING SEWING MACHINE.

APPLICATION FILED ram 21. 1914.

1,155,052, Patented Sept. 28, 1915.

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G. M. EAMES & J. S. HNCH.

OVERSEAMING SEWING MACHINE.

APPLICATION FILED MAYZI. 1914.

1,155,052. Patented Sept. 28, 1915.

2SHEETSSHEET2.

A TTOR/VEY COLUMBIA PLANOGRAFH CD.,WASHINOTON, n, c.

UNITED srarns Parana cr mes,

GEORGE M. EAMES AND JOHN S; FIKCH, OF BRIDGEZEQRT, CONNECTICUT, ASSIGNORS TO THE SINGER -MA1\T UFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

OVERSEAMING SEWING-MACHINE.

Specification of Letters Patent.

, AppIication-filedMay 21, 1914. Serial No. 839,928.

of F airfield and State of Connecticut, have invented certain new and useful Improve ments in Over'seaming Sewing-Machines, of which the following is aspecifi-cation, reference being had therein to the accompanying drawings. 7 I a i 4 This invention relates to improvements in overseaming sewing machines employing two loop-takersin connection with a single needle having reciprocating, oscillating and lateral movements, and has for its object to provide a stitch-forming mechanism capable of efiecting extremely narrow gage, even to the extent of producing seam having its successive stitches arranged in a straight or given line Without the liability ofoneofthe loop-takers interfering with the -loop=seizing action of the other "of saidloop-takers, and to this end there is provided a stitch-torming mechanism employing loop takers 'having oneor more rotationsand a fractional rotation foreach complete actuation of the needle.

Priorto the present invention it has been impractical to effect stitching of an extremely narrow gage as 'in-the earlierkcon:

structions each of the loop-seizing points of the loop-takers are "timed to enter the thread-loop at the same "pointin itheirlrotations, which makes liable the pickingup of the needle-thread by the loop-seizing "point arranged at the sideof the needle opposite the loop-seizing point effecting the deepseizing operation, and especially is thi-s I true when using a wiry or-hard twisted sewing thread which often throws out loop at both sides of the needlein th'e formation of a given stitch. I

'Referring'to'the drawings, Figure 1 is a view in front side elevation-cf 'an'overseaming sewing machine equipped with the pres ent kin-vention Fig. 2 plan of Fig. *1 'Fi g.

3 a front side elevation of Fig. 1. Figsml and :5 are plan views o'f the loop-takers, feed-dog and a portion oft he bedplate together with dotted line viewsof th'e throat or needle-plate, the former figure illustrat ing the loop takers arranged for -,efi cting a medium width of 'ga'ge and the cther of said figures for a comparatively narrow Figs. 6 and Treverse sides of aa'iabric illustrating wide and comparatively narrow gage seams respectively.

1 represents the bed-plate of the sewing machlne upon which is mounted the bracketarm comprising the arm standard 2 and arm bracket 8, 4 the main or needle-bar-driving Patented'Sept. as, 1915..

shaft carrying at its rear end the hand or band-wheel?) and at its opposite end the usual take-up cam 6 for actuating the takeup lever 7, the front face of said cam being provided with a stud bearing 8 upon which ispivoted one end of a needle-bar-actuating link '9. r

10 represents the needle-bar gate mounted to oscillate on pintle'screws, as 11, threaded intothe'head l2 oi' the arm bracket 3, and at its front edge provided with bearing hubs 13 and let and extension 15, the latter operatively connected through the needle-bar gate connection 16 with the adjustable slide 17 carried by the oscillating lever 18 provided with a downwardly extended bearing shaft 19, which latter is mounted to oscillate in a suitable bearing formed in the bracket20 secured by screws, as-2l, to the rear side of the arm bracket 3, the forward end of said oscillatingdever being provided with a hollow downwardly extended portion 23 in which is pivotally mounted the stem 24 (shown in dotted lines only, Fig. 2) of the cam follower 25, which latter tracks cam grooves, as 26, of the switch cam 27 carried by the main-shaft i, whereby-lateral movements are transmitted from the main-shaft to the gate 10. 1

In the bearing hub 13 is journaled a needle-bar bearing 28 provided at its upper end with a pinion 29, its opposite end being threadedto accommodate adjusting nuts, as 30, which latter, in connection with said pinion, act to hold the bearing against endwise movement in thehub "13, said bearing being provided with a keyway 31 which coacts with a key 32 carried by the needle-bar 33 to hold the latter against axial movement independently of the movements of the bearneedle-bar 38 provided with the needle 33,

collars 35-and 36 suitably: secured on said needle-bar actinglto transmit to the latter vertical movements corresponding to the so" i vertical movements of the tubular bearing,

link 9, thus vertical movements are transmitted from said main-shaft to said needlebar.

38 represents a spring-depressed clothpresser-carrying bar provided at its lower end with a cloth-presser 39 and carrying a Presser-lifting lug 40 for coacting with a manually operated presser-lifting lever 41, as in earlier constructions.

41 represents a rotating crank-shaft mounted in suitable bearings .depending from the bed-plate and operatively connected-with the main-shaft through a belt 42 and pulleys 43 and 43, later to be referred to, said crank-shaft beingprovided with a gear 44 which meshes with a gear 45, later to be referred to, carried by the loop-takeractuating shaft 46. V

47lrepresentsthe left hand and 48 the right hand loop-taker, each provided with a suitable thread-holding case, as 49, and a loop-taker shaft, as 50 (one only of which is shown), and to the lower end of each is suitably secured a bevel gear, as 51, which meshes with a like gear 52 carried by the loop-taker-actuating shaft 46, the shafts 50 being journaled in suitable bearings formed in the left and right hand saddles 58 and 54,

respectively, adjustably secured to the un-' derside of the bed-plate by suitable screws,

The means employed for giving to the feededog 56 its feed movements and controlling the ;amplitude of said movements may be of any suitable construction, one form of which is shown in the drawings, but it is not deemed necessary to specifically describe such mechanism, since it is well understood.

63 represents a segment gear pivoted on a bearing stud 64 threaded into the head 12 of the arm bracket, and having pivoted to it, by stud-screw 65, one end of a link 66 whose opposite end is pivotally mounted on a stud 67 carried by the adjustable slideblock 68 whichtracks the under-cut groove 69 formed in the oscillating lever 18, a wingnut 70 acting to hold said slide-block in the desired adjustment with respect to the axis of the bearing shaft 19, and said segment gear meshing with the pinion 29.

lVhen employing a single needle in connection with two loop-takers for efiecting stitches first at one and then at the opposite side of the median line of vertical movement of the needle, the needle must be given a half turn so that in the formation of each stitch the loop of needle-thread will be propneedle-plate 72, Fig. 4, represent the limit of lateral movement of the needle, that the present adjustment of the slide-block 17 in the groove 69 of the lever 18 represents the adjustment ofthe connection 16 to effect lateral movements of the needle corresponding to the distance between said needleopenings, and that the axis of the stud 67 connecting the link 66. with the segment gear 63 coincides with the axis of the bearing stud 19, the operation of the machine would cause the needle to be alined first with one and then with the other of said needle-openings,,and the now stationary segment gear wouldact on the pinion 29 to give the needle a half turn, thus effecting a like cooperation of needle and loop-takers, whether at one or the opposite side of the medianline of Vera means for giving to-the needle its half turn,

and to overcome this the slide-block is adjusted from the axis of the bearing stud 19, a distance sufficient to give to the segment gear such movement as is necessary to compensate for the shortening of the lateral movements of the needle, which form of needle control, makes practical the employment of a needle secured concentric with the axis of the needle-bar, and provides adjusting means for changing the amplitude of the lateral movements of said needle.

Referring now to the inventive features new to the present construction, the ratio'of the pulleys 43 and 43 are as two to one, thus giving to the shaft 41 two rotations to one of the shaft 4, and the ratio of the gears 44v and 45 are as one and one quarter to one,

thus giving to the shaft 46 one and one quarter rotations to one rotation of the shaft 41 or two and one half rotations to one rotation of the shaft 4 which, as will be readily understood, makes practical the timing of the loop-takers so that at the time the loopseizing point 7 4 is about to enter the threadloop the like points is farthest from their loop-seizing positions, which avoids any possibility of one of the loop-takers interfering with the loop-seizing action of its coacting loop-taker, as has been the difficulty in connection with the earlier constructions when stitching extremely narrow gaged seams.

Should any variety of product being acted upon by thevpresent construction require the stitching of a straightaway scam the opera'-. tor wouldadjust the pivot-stud v76 of the slide 17 to coincide with the axis of the shaft- 19, thus eliminating the lateral movements of the needle, and adjust the slide 68 rear-' ward a distance sufficient to cause the gear segment 63 to transmit to the pinion 29 and needle-bar a half turn, followed by substituting a throat or needle-plate having a single central needle-opening and giving to the loop-takers adjustments toward each other a distance suflicient to insure that their loop-seizing points will properly enter the needle-thread loop.

While the present embodiment of the invention is in connection with loop-takers having two and one half rotations to one complete actuation of the needle-carrying bar, it is evident that other complete and fractional rotations of the loop-takers to one complete actuation of the needle-carrying bar could be employed.

Having thus set forth the nature of the invention, what we claim herein is 1. In an overseaming sewing machine, the

combination with a stitch-forming mechanism including multiple loop-takers, and a needle-carrying bar and needle cooperating with each of said loop-takers to form stitches, of means for giving to said looptakers complete and fractional stitch-forming movements for each complete stitchforming movement of said needle.

2. In an overseaming sewing machine, the combination with a stitch-forming mechawith each of said loop-takers to form stitches, and means for giving to said needle reciprocating and oscillatory movements in a given path only, of means for giving to said loop-takers complete and fractional stitch-forming movements for each complete stitch-forming movement of said needle.

3. In an overseaming sewing machine, the combination with a stitch-forming mechanism I including multiple loop-takers, a needle-carrying bar and needle cooperating with'f each of said loop-takers to form stitches and means including coacting gear members for giving to said needlereciprocating and oscillatory movements, of means for giving to said loop-takers complete and fractional stitch-forming movements for each complete stitch-forming movement of said needle.

In testimony whereof, we have signed our names to this specification, in the presence of two subscribing witnesses.

GEORGE M. EAMES. JOHN S. FINGH. Witnesses:

WM. A. SAUTTER, FRANK M. WOOTTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). 0." 

